Electric burglar-alarm



UNITED STATES JOSEPH BARKHEIMER, OF DES MOINES, IOWA.

ELECTRIC BURGLAR ALARM.

forming part of Letters Patent No. 319,053, dated June 2, 1885.

Application filed April 25, 1884. (No model.)

To all whom it may concern.-

Be it known that I, JosEri-r Bxnxnnnunn, of Des Moines, in the county of Polk and State of Iowa, have invented an Improved Electric BurglanAlai-m, of which the following is a specification.

My invention consists in the construction and combination of circuit-closing devices with swinging doors and cond uctingwires and an electric bell, as hereinafter fully set forth, in such a manner that the opening of the door will close a circuit and ring the bell, and also in such a manner that when aperson removes a panel from a solid door or the woven-wire covering from a screen-door and attempts to pass through, the circuit will be closed and the hell rung to sound an alarm.

Figure 1 of the accompanying drawings is a perspective view of a section of a doorway and a section of a screeirdoor to which my devices are applied. Fig. 2 is a plan view of the arrangement of the parts fixed to the top of the doorway. Fig. 3 is a View of a transverse section of a doorway and transverse vertical sections of doors hinged to the doorway.

Jointly considered,these figures clearly illustrate the construct-ion, application, and operation of my complete invention.

A represents the top facing i or frame.

Nos. 1 and 2 are conducting-wires fixed in parallel position and near the edges of the facing A by means of staples, or in any suitable way. They extend through one of the sides of the frame and doorway and terminate in hooks or eyes that adapt them to be detachably connected with conducting wires Nos. 3 and i, that extend to the opposite poles of a battery,and electric bell located in the hall or other suitable position inside of a dwelling or other building.

13 is a spring-wire fixed to the wire No. 1 and bent into such a form that it will extend across the wire No. 2 and project past the shoulder and door-stop O. A knob may be formed on its free end to prevent it from pene trating or marking the door with which it comes in contact. In its normal condition this spring -wire and circuit-closer will press against the wire No. 2, as required, to conu a doorway nect the two wires Nos. 1 and 2, for the purpose of ringing the hell; but when the door D is closed it will engage the free end of the wire B and push it away from the wire No. 2, and the two wires Nos. 1 and 2 will be thus disconnected and the circuit opened as required to maintain the battery inoperative and the bell silent. It is therefore obvious that the door cannot be opened without closing the circuit and ringing the bell unless the wires 1 and 3 or 2 and 4 are disconnected.

F F are spring-wires fixed to the wire No. 2 in such a manner that they will, in their normal condition, press upon the wire No. 2 and close the circuit.

Gis a duplex spring pivoted against the top and inside of the frame of a screen'door', H, in such a manner that the free ends of the spring G will, when the door is closed, engage the free ends of spring circuit-closing wires F and press them away from the wire No. 1 and open the circuit, as required, to make the bat tery and bell inoperative. Opening the'screendoor H allows the springs F to resume their normal positions, as required to close the circuit and ring the bell.

J J represent cords or wires fastened to the lower end and inside of the door and to the free ends of the duplex springG at the top of the door in such a manner that they will retain the spring in a horizontal position, as required to operate the circuit-closers F, and also as required to close the circuit and ring the bell when an entrance is effected through the closed screen-door H. In warm seasons the inner solid doors, D, are frequently left open and the screendoors closed for exclud ing persons and to admit fresh air, and burglars seek entrance by cutting away the wire screen from the door -frame and passing through the closed frame. Pressure against either one of the cords or wires J will be transmitted to the spring G and withdraw one of its ends from one of the circuit-closers F and allow it to resume its normal position, close the circuit, and ring the bell.

Breaking or cutting either one of the wires J will allow the duplex spring to turn sufficiently on its pivot to produce the same result, so that pressing or severing either one of the wires .I when the screen-door is closed will cause an alarm tofrighten the depredator the duplex spring G, and cords or I Wires J, and to notify theinmates of an attempted and two doors,- substantiallyas shown and de- 10 burglary. I scribed, to operate in the manner set forth,

I claim as my invention-- for the purposes specified.

The combination of conductors Nos. 1 and JOSEPH BARKHEIMER.

2, fixed in a door-frame, the eonductingwires W'itnesses: Nos. 3 and 4, connected with an electric bell, THOMAS G. ORWIG, the spring-wires and circuit-closers B and F, D. 'M. XVARD. 

